net: do not re-emit stream errors

fix #7015

lib/_stream_writable.js

@@ -104,6 +104,9 @@ function WritableState(options, stream) {
   this.writelen = 0;
 
   this.buffer = [];
+
+  // True if the error was already emitted and should not be thrown again
+  this.errorEmitted = false;
 }
 
 function Writable(options) {
@@ -232,6 +235,7 @@ function onwriteError(stream, state, sync, er, cb) {
   else
     cb(er);
 
+  stream._writableState.errorEmitted = true;
   stream.emit('error', er);
 }
 

lib/net.js

@@ -122,7 +122,6 @@ exports._normalizeConnectArgs = normalizeConnectArgs;
 // called when creating new Socket, or when re-using a closed Socket
 function initSocketHandle(self) {
   self.destroyed = false;
-  self.errorEmitted = false;
   self.bytesRead = 0;
   self._bytesDispatched = 0;
 
@@ -436,11 +435,11 @@ Socket.prototype._destroy = function(exception, cb) {
 
   function fireErrorCallbacks() {
     if (cb) cb(exception);
-    if (exception && !self.errorEmitted) {
+    if (exception && !self._writableState.errorEmitted) {
       process.nextTick(function() {
         self.emit('error', exception);
       });
-      self.errorEmitted = true;
+      self._writableState.errorEmitted = true;
     }
   };
 

test/simple/test-net-error-twice.js

@@ -0,0 +1,50 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common');
+var assert = require('assert');
+var net = require('net');
+
+var buf = new Buffer(2 * 1024 * 1024);
+
+buf.fill(0x62);
+
+var errs = [];
+
+var srv = net.createServer(function onConnection(conn) {
+  conn.write(buf);
+  conn.on('error', function (err) {
+    errs.push(err);
+    if (errs.length > 1 && errs[0] === errs[1])
+      assert(false, "We should not be emitting the same error twice");
+  });
+}).listen(common.PORT, function () {
+  var client = net.connect({ port: common.PORT });
+
+  client.on('connect', function () {
+    client.resume();
+    client.destroy();
+  });
+}).unref();
+
+process.on('exit', function() {
+  assert.equal(errs.length, 1);
+});